New Moon coin

[Goose]

I have a 2005 (?) $1 Niue coin minted for the 150th anniversary of Thomas Edison inventing the light bulb. On the obverse is a rendition of Edison and on the reverse is a tiny light bulb. You press Edison on the obverse and the light bulb on the reverse lights. Now if an island country can have a coin minted with a battery and light bulb in it, why does the U S have to revert to old coin designs (Walking Liberty half - Buffalo nickel - Mercury dime) to produce "new" coinage? GEEZE !